[PATCH] Implement a workaround for GNU mak jobserver

[Martin Liška]

On 10/27/20 12:02 PM, H.J. Lu via Binutils wrote:
> since the '+' is missing on the recipe line in Makefiles generated by
> automake.  Add the '+' to the recipe line by hand.

Hey.

Tested-by: Martin Liska  <mliska@suse.cz>

Thanks for the patch,
Martin